The rise of AI-generated content has created new challenges for digital content creators, educators, publishers and marketers. How can you ensure content quality and authenticity when AI tools like ChatGPT can produce human-like text on any topic in seconds?

This article reviews the 7 top AI content detection tools to help identify machine-written text. We tested the accuracy, ease of use and key features of the leading solutions.

Overview of AI Content Detection

Before diving into the reviews, let’s briefly overview how AI detection tools work and why they matter.

What is AI-Generated Content?

AI-generated content refers to text, images or video created by artificial intelligence systems rather than humans. The most common form is AI-written text, which exploded in popularity after the launch of ChatGPT in late 2022.

ChatGPT and tools like Anthropic’s Claude can produce articles, essays, tweets, ads, emails and more on virtually any prompt with quality resembling human work.

The Risks of AI Content

The core risk is misrepresenting AI output as human-created when it is not. This erodes trust and threatens content quality.

Specific issues include:

• Plagiarism: AI tools can remix and repurpose content without attribution.
• Inaccuracy: AI can make up facts, stats and details or repeat outdated information.
• Bias: AI models reflect biases in data used to train them.

The Case for Detection

Identifying AI content with the help of reliable AI detector services from Smodin, for example, allows creators, publishers and platforms to:

• Maintain trust and transparency with audiences
• Uphold quality standards and policies
• Provide attribution to AI creators
• Assess content accuracy and risks

Automated detection complements manual reviews to handle volumes of user-generated text efficiently.

Testing Methodology

We tested seven AI detection services that offer free trials or freemium access. Solutions focused solely on academic integrity were excluded.

The tools were evaluated on:

• Accuracy: Ability to correctly identify AI vs human text
• Usability: Ease of getting set up and using the tool
• Capabilities: Detection strength plus additional features
• Pricing: Free and paid plans available

We generated text samples using Claude and GPT-4o for the tests. The samples include blog posts, tweets, emails, poems and conversational text.

7 Best AI Content Detectors

Here are the top tools we recommend based on hands-on testing:

1. QuillBot AI Detector

QuillBot AI Detector stands out for users who want accurate AI detection inside a full writing and editing ecosystem. Since it’s built into QuillBot’s existing platform, it allows writers to check, refine, and improve content in one place without switching tools.

Accuracy

In testing, QuillBot AI Detector consistently identified AI-generated content across academic, professional, and marketing samples. It is particularly strong at recognizing paraphrased or “humanized” AI text, where wording may be altered but underlying patterns remain. Because the tool is trained alongside QuillBot’s own writing models, its detection engine is continuously updated to keep pace with new AI generation behaviors.

Ease of Use

The process is straightforward:

• Paste or upload your text
• Get a clear “Human” vs. “AI” likelihood score
• View highlighted passages for transparency

The interface is clean, minimal, and accessible for users who need quick validation without advanced technical controls.

Capabilities

QuillBot is not just an AI detector; it’s part of a complete writing suite:

• Grammar and style checker
• Paraphraser with multiple tone modes
• Summarizer
• Citation generator
• Translator

This makes QuillBot particularly useful for students, research teams, content creators, and organizations that want both detection and editing in a single workflow.

Pricing

The AI Detector is available with QuillBot Free and Premium accounts. Free users can run shorter text checks, while Premium plans increase input limits and offer full access to QuillBot’s writing toolkit. Team and institutional licensing is available for education and enterprise use.

2. GPTZero: Best for Enterprise-Grade Detection

GPTZero has rapidly emerged as the gold standard in AI detection, providing industry-leading accuracy backed by independent benchmarks. This powerful tool combines precision with practical features that make it indispensable for educators, content teams and enterprises.

Accuracy

GPTZero stands out with exceptional performance across our test samples. Independent testing on the RAID benchmark confirmed GPTZero as the most accurate commercial AI detector in North America, correctly identifying 95.7% of AI texts while maintaining just a 1% false positive rate on human content.

What sets GPTZero apart is its ability to detect sophisticated AI models including GPT-5, Claude, Gemini, and even reasoning models like ChatGPT o1 with 98%+ accuracy. The tool excels at identifying mixed human-AI content and text that has been polished by LLMs, not just straightforward AI-generated material.

Ease of Use

GPTZero provides multiple scanning options to fit different workflows:

• Paste text or upload single documents up to 50,000 characters
• Batch file upload for processing multiple documents simultaneously
• Browser extensions for Chrome and Edge to check content anywhere on the web
• Real-time detection as you write in Google Docs

The interface delivers color-coded highlights showing exactly which sentences appear AI-generated, along with an overall probability score.

Capabilities

Beyond detection, GPTZero offers a comprehensive suite of content verification tools:

• Plagiarism checker
• Writing replay feature showing edit history to verify authorship
• API integration for enterprise workflows
• Bulk document processing up to 250 files at once

The tool’s dashboard provides detailed statistics including perplexity and burstiness metrics that reveal AI writing patterns.

Pricing

GPTZero offers a generous free plan allowing 10,000 words scanned per month. Paid plans start at $15 per month for the Essential tier, with Premium at $24 monthly and Professional at $35 monthly (with 33% discount when billed annually).

3. Copyleaks: Best for Bulk Detection

Copyleaks offers reliable AI detection with a focus on supporting content teams and large-scale operations.

Accuracy

In our tests, Copyleaks provided accurate AI detection across different content types that were on par with Smodin.

A few samples that tripped up other tools were correctly classified by Copyleaks. The tool seems well-equipped to handle variations in AI writing styles.

Ease of Use

The interface allows single uploads as well as bulk batch processing. Useful filters help dig through detection results.

A browser extension lets you check web pages instantly. APIs are available to integrate detection into workflows.

Capabilities

Copyleaks was originally built for plagiarism checking. Alongside AI detection, key features include:

• Bulk content processing
• Custom API access
• MS Word plugin
• Browser extension

Pricing

Copyleaks offers a free trial. Paid plans start at $14 per month, billed annually for individuals, and go up based on word count needs and team size.

4. ZeroGPT: Promising New Detection Tool

ZeroGPT is a promising new AI detection tool that claims high accuracy, though Originality.ai scored better in independent tests. The tool is easy to use and has clear results.

Accuracy

ZeroGPT claims over 98% accuracy in detecting AI content. However, third-party tests have found Originality.ai to be more reliable. As a new offering, ZeroGPT detection may continue improving.

Ease of Use

The tool has a straightforward interface:

• Paste or upload text
• View AI highlights
• See the overall AI percentage

Free users can process 15,000 characters per check. Paid plans support up to 100,000.

Capabilities

ZeroGPT focuses specifically on detecting AI-generated text, including outputs from ChatGPT, Claude and others.

Pricing

It offers free and paid plans ranging up to $26.99 per month. The free plan provides detection for up to 15,000 characters.

5. Scribbr: Best Free Starter Tool

Scribbr offers a capable free AI detector that works for basic detection needs despite some accuracy limitations.

Scribbr demonstration

Accuracy

During our tests, Scribbr correctly identified most AI content samples.

However, it struggled with some conversational text and did miss a few samples. Precision seems higher with more formal writing styles.

As a free starter tool, it can still be quite useful, but expect to do some double-checking.

Ease of Use

Scribbr’s detector shares an interface with its other editing tools:

• Paste or upload text
• View AI highlights
• See overall score

Free users are limited to 1,200 words per check.

Capabilities

Alongside AI detection, Scribbr provides free access to key editing tools:

• Grammar checker
• Plagiarism checker
• Readability analysis
• Proofreader
• Paraphrasing

Pricing

Scribbr offers what is likely the most robust freemium offering among commercial detection tools. Free users get 5 checks per week.

Paid plans with unlimited checks start at €9.99 monthly but aren’t mandatory to start out.

6. Quetext: Best Newcomer

Quetext is a promising recent entrant, offering free AI detection backed by a proven plagiarism checker.

Accuracy

This new tool is off to a strong start, correctly identifying the majority of our AI content samples with few false positives on human text.

Early accuracy puts it on par with more established competitors. As Quetext gathers more data, results should only improve.

Ease of Use

Quetext provides an intuitive interface familiar to plagiarism checkers:

• Enter or upload text
• View color-coded highlights
• See the overall match percentage

Free users can process up to 250 words per check.

Capabilities

The tool aims to detect AI-generated or altered text and unattributed copying.

Alongside AI detection, key features include:

• Plagiarism checker
• Readability metrics
• Grammar suggestions
• Text rewriting

Pricing

Quetext offers detection for free with no registration required. Paid plans unlock additional features starting at $16 per month.

7. Grammarly: Popular But Less Accurate

Grammarly aims to add AI detection to its popular editing tool suite but delivers mixed accuracy results for now.

Accuracy

As an early capability, Grammarly’s AI detector only recognized about half of the test samples correctly during our evaluation.

A lot of AI content passed through without flags. The tool currently seems optimized to limit false positives more than catch-all AI text.

Ease of Use

Grammarly’s smooth, familiar interface makes it easy to check work:

• Enter or paste text in the editor
• View highlight marks
• See the overall AI score

Detection activates automatically as you type or when processing a document.

Capabilities

Grammarly seeks to round out its robust editing capabilities with AI detection:

• Grammar checker
• Plagiarism checker
• Tone adjustments
• Readability metrics
• Word choice suggestions

Pricing

Grammarly offers a free plan. AI detection and more advanced capabilities require a paid subscription starting at $12 per month, billed annually.

8. Winston AI: Leading Integrated Detector

Winston AI combines AI detection capabilities with integrated plagiarism checking and image analysis.

Accuracy

The tool claims 99.98% accuracy but scored lower in third-party testing. Continued development may boost reliability.

Ease of Use

Winston AI provides an intuitive interface:

• Enter text or upload documents
• View highlights
• See overall AI probability

Capabilities

Alongside AI detection, Winston AI provides:

• Plagiarism checking
• Image analysis to catch AI-generated art
• Browser extension

Pricing

Winston AI plans range from free to $32 per month. Free users can run 2,000 detections over 14 days.

Key Takeaways and Next Steps

With AI-generated content on the rise, automated detection provides a scalable way to identify machine text risks across volumes of user-generated content.

Our testing found an emerging group of capable detection tools available. Smodin led overall for accuracy and features, with Copyleaks, Two Neurons and Scribbr also excelling in certain capability or pricing dimensions.

No solution is perfect yet. But maturing options now enable creators, educators and platforms to:

• Audit content libraries for existing AI usage
• Filter user submissions to identify AI text
• Alert reviewers to assess, edit or attribute AI content before publication
• Block AI content that violates policies around creation, topic, quality or facts

Detection works best together with human review processes to account for accuracy limitations.

Look to deploy a shortlist of detectors suited to your use case:

• Individuals: Start with free tools like Two Neurons or Scribbr
• Teams: Consider Smodin or Copyleaks for expanded capabilities
• Enterprises: Evaluate Scribbr, Copyleaks or custom API options

Ongoing tool updates and new entrants promise continued advancement in accuracy, speed and scope. Stay tuned for the latest developments. Hopefully, this review will provide a useful starting point for evaluating AI detection in your content.